Buggy code:
public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWrapper { private static final Log logger = LogFactory . getLog ( BeanWrapperImpl . class ) ; private Object object ; private String nestedPath = "" ; private Object rootObject ; private TypeConverterDelegate typeConverterDelegate ; private CachedIntrospectionResults cachedIntrospectionResults ; private Map < String , BeanWrapperImpl > nestedBeanWrappers ; private AccessControlContext acc ; private boolean autoGrowNestedPaths ; public BeanWrapperImpl ( ) { } public BeanWrapperImpl ( boolean registerDefaultEditors ) { } public BeanWrapperImpl ( Object object ) { } public BeanWrapperImpl ( Class < ? > clazz ) { } public BeanWrapperImpl ( Object object , String nestedPath , Object rootObject ) { } private BeanWrapperImpl ( Object object , String nestedPath , BeanWrapperImpl superBw ) { } public void setWrappedInstance ( Object object ) { } public void setWrappedInstance ( Object object , String nestedPath , Object rootObject ) { } public void setSecurityContext ( AccessControlContext acc ) { } public final Object getWrappedInstance ( ) { } public final Class getWrappedClass ( ) { } public final String getNestedPath ( ) { } public final Object getRootInstance ( ) { } public final Class getRootClass ( ) { } public boolean getAutoGrowNestedPaths ( ) { } public void setAutoGrowNestedPaths ( boolean autoGrowNestedPaths ) { } protected void setIntrospectionClass ( Class clazz ) { } private CachedIntrospectionResults getCachedIntrospectionResults ( ) { } public PropertyDescriptor [ ] getPropertyDescriptors ( ) { } public PropertyDescriptor getPropertyDescriptor ( String propertyName ) throws BeansException { } protected PropertyDescriptor getPropertyDescriptorInternal ( String propertyName ) throws BeansException { } @ Override public Class getPropertyType ( String propertyName ) throws BeansException { } public TypeDescriptor getPropertyTypeDescriptor ( String propertyName ) throws BeansException { } public boolean isReadableProperty ( String propertyName ) { } public boolean isWritableProperty ( String propertyName ) { } public < T > T convertIfNecessary ( Object value , Class < T > requiredType , MethodParameter methodParam ) throws TypeMismatchException { } public Object convertForProperty ( Object value , String propertyName ) throws TypeMismatchException { } private String getFinalPath ( BeanWrapper bw , String nestedPath ) { } protected BeanWrapperImpl getBeanWrapperForPropertyPath ( String propertyPath ) { } private BeanWrapperImpl getNestedBeanWrapper ( String nestedProperty ) { } private Object setDefaultValue ( String propertyName ) { } private Object setDefaultValue ( BeanWrapperImpl . PropertyTokenHolder tokens ) { } private PropertyValue createDefaultPropertyValue ( BeanWrapperImpl . PropertyTokenHolder tokens ) { } private Object newValue ( Class < ? > type , String name ) { try { if ( type . isArray ( ) ) { Class < ? > componentType = type . getComponentType ( ) ; if ( componentType . isArray ( ) ) { Object array = Array . newInstance ( componentType , 1 ) ; Array . set ( array , 0 , Array . newInstance ( componentType . getComponentType ( ) , 0 ) ) ; return array ; } else { return Array . newInstance ( componentType , 0 ) ; } } else { if ( Collection . class . isAssignableFrom ( type ) ) { return CollectionFactory . createCollection ( type , 16 ) ; } else { return type . newInstance ( ) ; } } } catch ( InstantiationException e ) { <START_BUG> throw new NullValueInNestedPathException ( getRootClass ( ) , ( ( this . nestedPath ) + name ) , ( ( "Could<seq2seq4repair_space>not<seq2seq4repair_space>instantiate<seq2seq4repair_space>propertyType<seq2seq4repair_space>[" + ( type . getName ( ) ) ) + "]<seq2seq4repair_space>to<seq2seq4repair_space>auto-grow<seq2seq4repair_space>nestd<seq2seq4repair_space>property<seq2seq4repair_space>path" ) ) ; <END_BUG> } catch ( IllegalAccessException e ) { throw new NullValueInNestedPathException ( getRootClass ( ) , ( ( this . nestedPath ) + name ) , ( ( "Could<seq2seq4repair_space>not<seq2seq4repair_space>instantiate<seq2seq4repair_space>propertyType<seq2seq4repair_space>[" + ( type . getName ( ) ) ) + "]<seq2seq4repair_space>to<seq2seq4repair_space>auto-grow<seq2seq4repair_space>nested<seq2seq4repair_space>property<seq2seq4repair_space>path" ) ) ; } } protected BeanWrapperImpl newNestedBeanWrapper ( Object object , String nestedPath ) { } private BeanWrapperImpl . PropertyTokenHolder getPropertyNameTokens ( String propertyName ) { } @ Override public Object getPropertyValue ( String propertyName ) throws BeansException { } private Object getPropertyValue ( BeanWrapperImpl . PropertyTokenHolder tokens ) throws BeansException { } private Object growArrayIfNecessary ( Object array , int index , String name ) { } private void growCollectionIfNecessary ( Collection collection , int index , String name , PropertyDescriptor pd , int nestingLevel ) { } @ Override public void setPropertyValue ( String propertyName , Object value ) throws BeansException { } @ Override public void setPropertyValue ( PropertyValue pv ) throws BeansException { } @ SuppressWarnings ( "unchecked" ) private void setPropertyValue ( BeanWrapperImpl . PropertyTokenHolder tokens , PropertyValue pv ) throws BeansException { } @ Override public String toString ( ) { } private static class PropertyTokenHolder { public String canonicalName ; public String actualName ; public String [ ] keys ; } }

Fix:
throw new NullValueInNestedPathException ( getRootClass ( ) , ( ( this . nestedPath ) + name ) , ( ( "Could<seq2seq4repair_space>not<seq2seq4repair_space>instantiate<seq2seq4repair_space>propertyType<seq2seq4repair_space>[" + ( type . getName ( ) ) ) + "]<seq2seq4repair_space>to<seq2seq4repair_space>auto-grow<seq2seq4repair_space>nested<seq2seq4repair_space>property<seq2seq4repair_space>path" ) ) ;